XML 116 R92.htm IDEA: XBRL DOCUMENT
v3.10.0.1

Business Combinations Estimated Fair Values Of Assets Acquired And Liabilities Assumed (Details) - USD ($) | Nov. 15, 2018 | May 01, 2018 | Dec. 31, 2018
--- | --- | --- | ---
First BancTrust [Member] |  |  |
Business Acquisition [Line Items] |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Cash and Equivalents |  | $ 20,598,000 |
Business Combination, Recognized Identifiable Assets and Liabilities Assumed, Securities |  | (59,586,000) |
Business Combination, Recognized Identifiable Assets and Liabilities Assumed, Loans |  | (363,281,000) |
Business Combination Recognized Identifiable Assets Acquired and Liabilities Assumed Allowance For Loan Losses |  | 0 |
Business Combination, Recognized Identifiable Assets and Liabilities Assumed, Repossessed Assets |  | (535,000) |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Premises And Equipment |  | 9,437,000 |
Business Acquisition, Goodwill, Non-deductible Amount |  | 26,491,000 |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill |  | 5,224,000 |
Business Combination Recognized Identifiable Assets Acquired And Liabilities Assumed, Other Assets |  | 16,133,000 |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Assets |  | 501,285,000 |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Deposits |  | (385,624,000) |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, FHLB Advances |  | (30,672,000) |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Subordinated Debentures |  | (4,735,000) |
Business Combination Recognized Identifiable Assets Acquired And Liabilities Assumed, Other Liabilities |  | 8,629,000 |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Liabilities |  | 429,660,000 |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Net |  | $ 71,625,000 |
Finite-Lived Intangible Asset, Useful Life |  | 10 years |
Aggregate Total Of Cash Paid In Business Combination |  | $ 10,275,000 |
Business Acquisition, Equity Interest Issued or Issuable |  | 61,350,000 |
Business Combination, Value of Total Consideration Paid |  | $ 71,625,000 |
Business Acquisition, YTD Transaction Costs |  |  | $ 7,300,000
SCB Bancorp [Member] |  |  |
Business Acquisition [Line Items] |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Cash and Equivalents | $ 65,112,000 |  |
Business Combination, Recognized Identifiable Assets and Liabilities Assumed, Securities | (97,504,000) |  |
Business Combination, Recognized Identifiable Assets and Liabilities Assumed, Loans | (247,561,000) |  |
Business Combination Recognized Identifiable Assets Acquired and Liabilities Assumed Allowance For Loan Losses | 0 |  |
Business Combination, Recognized Identifiable Assets and Liabilities Assumed, Repossessed Assets | (438,000) |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Premises And Equipment | 11,343,000 |  |
Business Acquisition, Goodwill, Non-deductible Amount | 18,636,000 |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill | 7,269,000 |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles | 12,298,000 |  |
Business Combination Recognized Identifiable Assets Acquired And Liabilities Assumed, Other Assets | 18,895,000 |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Assets | 479,056,000 |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Deposits | (347,971,000) |  |
Business Combination Recognized Identifiable Assets Acquired And Liabilities Assumed, Securities Sold Under Agreements to Repurchase | 21,180,000 |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, FHLB Advances | (18,971,000) |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Liabilities, Long-term Debt | 7,724,000 |  |
Business Combination Recognized Identifiable Assets Acquired And Liabilities Assumed, Other Liabilities | 15,904,000 |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Liabilities | 411,750,000 |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Net | 67,306,000 |  |
Finite-Lived Intangible Asset, Useful Life |  | 10 years |
Aggregate Total Of Cash Paid In Business Combination | 19,046,000 |  |
Business Acquisition, Equity Interest Issued or Issuable | 48,260,000 |  |
Business Combination, Value of Total Consideration Paid | 67,306,000 |  |
Business Acquisition, YTD Transaction Costs |  |  | $ 907,000
Acquired Book Value [Member] | First BancTrust [Member] |  |  |
Business Acquisition [Line Items] |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Cash and Equivalents |  | $ 20,598,000 |
Business Combination, Recognized Identifiable Assets and Liabilities Assumed, Securities |  | (59,906,000) |
Business Combination, Recognized Identifiable Assets and Liabilities Assumed, Loans |  | (371,156,000) |
Business Combination Recognized Identifiable Assets Acquired and Liabilities Assumed Allowance For Loan Losses |  | (4,412,000) |
Business Combination, Recognized Identifiable Assets and Liabilities Assumed, Repossessed Assets |  | (547,000) |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Premises And Equipment |  | 10,126,000 |
Business Acquisition, Goodwill, Non-deductible Amount |  | 543,000 |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill |  | 0 |
Business Combination Recognized Identifiable Assets Acquired And Liabilities Assumed, Other Assets |  | 16,389,000 |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Assets |  | 474,853,000 |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Deposits |  | (384,323,000) |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, FHLB Advances |  | (31,000,000) |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Subordinated Debentures |  | (6,186,000) |
Business Combination Recognized Identifiable Assets Acquired And Liabilities Assumed, Other Liabilities |  | 8,665,000 |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Liabilities |  | 430,174,000 |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Net |  | 44,679,000 |
Acquired Book Value [Member] | SCB Bancorp [Member] |  |  |
Business Acquisition [Line Items] |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Cash and Equivalents | 65,112,000 |  |
Business Combination, Recognized Identifiable Assets and Liabilities Assumed, Securities | (97,545,000) |  |
Business Combination, Recognized Identifiable Assets and Liabilities Assumed, Loans | (255,429,000) |  |
Business Combination Recognized Identifiable Assets Acquired and Liabilities Assumed Allowance For Loan Losses | (4,491,000) |  |
Business Combination, Recognized Identifiable Assets and Liabilities Assumed, Repossessed Assets | (783,000) |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Premises And Equipment | 10,115,000 |  |
Business Acquisition, Goodwill, Non-deductible Amount | 6,782,000 |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill | 0 |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles | 1,228,000 |  |
Business Combination Recognized Identifiable Assets Acquired And Liabilities Assumed, Other Assets | 24,821,000 |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Assets | 457,324,000 |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Deposits | (348,314,000) |  |
Business Combination Recognized Identifiable Assets Acquired And Liabilities Assumed, Securities Sold Under Agreements to Repurchase | 21,180,000 |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, FHLB Advances | (19,000,000) |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Liabilities, Long-term Debt | 7,724,000 |  |
Business Combination Recognized Identifiable Assets Acquired And Liabilities Assumed, Other Liabilities | 15,904,000 |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Liabilities | 412,122,000 |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Net | 45,202,000 |  |
Fair Value Adjustments [Member] | First BancTrust [Member] |  |  |
Business Acquisition [Line Items] |  |  |
Business Combination, Recognized Identifiable Assets and Liabilities Assumed, Securities |  | (320,000) |
Business Combination, Recognized Identifiable Assets and Liabilities Assumed, Loans |  | (7,875,000) |
Business Combination Recognized Identifiable Assets Acquired and Liabilities Assumed Allowance For Loan Losses |  | (4,412,000) |
Business Combination, Recognized Identifiable Assets and Liabilities Assumed, Repossessed Assets |  | (12,000) |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Premises And Equipment |  | (689,000) |
Business Acquisition, Goodwill, Non-deductible Amount |  | 25,948,000 |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill |  | 5,224,000 |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles |  | 5,224,000 |
Business Combination Recognized Identifiable Assets Acquired And Liabilities Assumed, Other Assets |  | (256,000) |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Assets |  | 26,432,000 |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Deposits |  | (1,301,000) |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, FHLB Advances |  | 328,000 |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Subordinated Debentures |  | (1,451,000) |
Business Combination Recognized Identifiable Assets Acquired And Liabilities Assumed, Other Liabilities |  | (36,000) |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Liabilities |  | (514,000) |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Net |  | 26,946,000 |
Fair Value Adjustments [Member] | SCB Bancorp [Member] |  |  |
Business Acquisition [Line Items] |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Cash and Equivalents | 0 |  |
Business Combination, Recognized Identifiable Assets and Liabilities Assumed, Securities | (41,000) |  |
Business Combination, Recognized Identifiable Assets and Liabilities Assumed, Loans | (7,868,000) |  |
Business Combination Recognized Identifiable Assets Acquired and Liabilities Assumed Allowance For Loan Losses | (4,491,000) |  |
Business Combination, Recognized Identifiable Assets and Liabilities Assumed, Repossessed Assets | (345,000) |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Premises And Equipment | 1,228,000 |  |
Business Acquisition, Goodwill, Non-deductible Amount | 11,854,000 |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill | 7,269,000 |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles | 11,070,000 |  |
Business Combination Recognized Identifiable Assets Acquired And Liabilities Assumed, Other Assets | (5,926,000) |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Assets | 21,732,000 |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Deposits | (343,000) |  |
Business Combination Recognized Identifiable Assets Acquired And Liabilities Assumed, Securities Sold Under Agreements to Repurchase | 0 |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, FHLB Advances | (29,000) |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Liabilities, Long-term Debt | 0 |  |
Business Combination Recognized Identifiable Assets Acquired And Liabilities Assumed, Other Liabilities | 0 |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Liabilities | (372,000) |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Net | 22,104,000 |  |
Fair Value Adjustments, Accretable portion [Member] | First BancTrust [Member] |  |  |
Business Acquisition [Line Items] |  |  |
Business Combination, Recognized Identifiable Assets and Liabilities Assumed, Loans |  | $ (3,600,000) |
Fair Value Adjustments, Accretable portion [Member] | SCB Bancorp [Member] |  |  |
Business Acquisition [Line Items] |  |  |
Business Combination, Recognized Identifiable Assets and Liabilities Assumed, Loans | $ (7,200,000) |  |

X
- Definition Portion of business acquisition purchase price paid in cash + References No definition available. + Details
Name: | fmbh_AggregateTotalOfCashPaidInBusinessCombination
Namespace Prefix: | fmbh_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Business Acquisition, Goodwill, Non-deductible Amount + References No definition available. + Details
Name: | fmbh_BusinessAcquisitionGoodwillNondeductibleAmount
Namespace Prefix: | fmbh_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition YTD Transaction Costs that were incurred during current year + References No definition available. + Details
Name: | fmbh_BusinessAcquisitionYTDTransactionCosts
Namespace Prefix: | fmbh_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Business Combination Recognized Identifiable Assets Acquired And Liabilities Assumed, Other Assets + References No definition available. + Details
Name: | fmbh_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedOtherAssets
Namespace Prefix: | fmbh_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Business Combination Recognized Identifiable Assets Acquired And Liabilities Assumed, Other Liabilities + References No definition available. + Details
Name: | fmbh_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedOtherLiabilities
Namespace Prefix: | fmbh_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Business Combination Recognized Identifiable Assets Acquired And Liabilities Assumed, Securities Sold Under Agreements to Repurchase + References No definition available. + Details
Name: | fmbh_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedSecuritiesSoldUnderAgreementstoRepurchase
Namespace Prefix: | fmbh_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Business Combination Recognized Identifiable Assets Acquired and Liabilities Assumed Allowance For Loan Losses + References No definition available. + Details
Name: | fmbh_BusinessCombinationRecognizedIdentifiableAssetsAcquiredandLiabilitiesAssumedAllowanceForLoanLosses
Namespace Prefix: | fmbh_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Business Combination: Approximate Deposits to be acquired + References No definition available. + Details
Name: | fmbh_BusinessCombinationRecognizedIdentifiableAssetsAcquiredandLiabilitiesAssumedDeposits
Namespace Prefix: | fmbh_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, FHLB Advances + References No definition available. + Details
Name: | fmbh_BusinessCombinationRecognizedIdentifiableAssetsAcquiredandLiabilitiesAssumedFHLBAdvances
Namespace Prefix: | fmbh_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Premises And Equipment + References No definition available. + Details
Name: | fmbh_BusinessCombinationRecognizedIdentifiableAssetsAcquiredandLiabilitiesAssumedPremisesAndEquipment
Namespace Prefix: | fmbh_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Subordinated Debentures + References No definition available. + Details
Name: | fmbh_BusinessCombinationRecognizedIdentifiableAssetsAcquiredandLiabilitiesAssumedSubordinatedDebentures
Namespace Prefix: | fmbh_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Approximate amount of loans to acquired in Business Combination + References No definition available. + Details
Name: | fmbh_BusinessCombinationRecognizedIdentifiableAssetsandLiabilitiesAssumedLoans
Namespace Prefix: | fmbh_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Business Combination, Recognized Identifiable Assets and Liabilities Assumed, Repossessed Assets + References No definition available. + Details
Name: | fmbh_BusinessCombinationRecognizedIdentifiableAssetsandLiabilitiesAssumedRepossessedAssets
Namespace Prefix: | fmbh_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Business Combination, Recognized Identifiable Assets and Liabilities Assumed, Securities + References No definition available. + Details
Name: | fmbh_BusinessCombinationRecognizedIdentifiableAssetsandLiabilitiesAssumedSecurities
Namespace Prefix: | fmbh_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Business Combination, Value of Total Consideration Paid + References No definition available. + Details
Name: | fmbh_BusinessCombinationValueofTotalConsiderationPaid
Namespace Prefix: | fmbh_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
Name: | us-gaap_BusinessAcquisitionLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Amount of equity interests of the acquirer, including instruments or interests issued or issuable in consideration for the business combination. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 30 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=109124213&loc=d3e6613-128477 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 30 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=109124213&loc=d3e6578-128477 + Details
Name: | us-gaap_BusinessCombinationConsiderationTransferredEquityInterestsIssuedAndIssuable
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Amount of assets acquired at the acquisition date. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=84161108&loc=d3e4845-128472 + Details
Name: | us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAssets
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Amount of currency on hand as well as demand deposits with banks or financial institutions, acquired at the acquisition date. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=84161108&loc=d3e4845-128472 + Details
Name: | us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCashAndEquivalents
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Amount of long-term debt due within one year or within the normal operating cycle, if longer, assumed at the acquisition date. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=84161108&loc=d3e4845-128472 + Details
Name: | us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentLiabilitiesLongTermDebt
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Amount of intangible assets, excluding goodwill, acquired at the acquisition date. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=84161108&loc=d3e4845-128472 + Details
Name: | us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibleAssetsOtherThanGoodwill
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition The amount of identifiable intangible assets recognized as of the acquisition date. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 55 -Paragraph 37 -URI http://asc.fasb.org/extlink&oid=108330185&loc=d3e2207-128464 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=84161108&loc=d3e4845-128472 + Details
Name: | us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibles
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Amount of liabilities assumed at the acquisition date. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=84161108&loc=d3e4845-128472 + Details
Name: | us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLiabilities
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Amount recognized as of the acquisition date for the identifiable assets acquired in excess of (less than) the aggregate liabilities assumed. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 55 -Paragraph 37 -URI http://asc.fasb.org/extlink&oid=108330185&loc=d3e2207-128464 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=84161108&loc=d3e4845-128472 + Details
Name: | us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNet
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Useful life of finite-lived intangible assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References No definition available. + Details
Name: | us-gaap_FiniteLivedIntangibleAssetUsefulLife
Namespace Prefix: | us-gaap_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | us-gaap_BusinessAcquisitionAxis=fmbh_FirstBancTrustMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_BusinessAcquisitionAxis=fmbh_SCBBancorpMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | fmbh_AcquisitionValueAxis=fmbh_AcquiredBookValueMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | fmbh_AcquisitionValueAxis=fmbh_FairValueAdjustmentsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | fmbh_AcquisitionValueAxis=fmbh_FairValueAdjustmentsAccretableportionMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |